"A recommended way of keeping track of exactly how long any product with a shelf life has been opened. Waiting until something smells or separates might be past the time when harmful bacteria is present."
Dr. Jennifer L. Melville, M.D., M.P.H.
"A great idea to keep track of how long products have been opened, including personal products and feminine products."
Dr. Dorcas McLennan, M.D.